<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <input type="text" name="" id="">
  <script>
const input = document.querySelector('input');
// input.addEventListener('keydown', function () {
//   console.log('键盘按下');
// });
// input.addEventListener('keyup', function () {
//   console.log('键盘抬起');
// });
input.addEventListener('input', function () {
  console.log('用户输入了');
});
  </script>
</body>
</html>